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Hydatina zonata
 
(Solander in Lightfoot, 1786)
 
Hydatina zonata
Maximum size:  40 mm shell length (Kay, 1979).

Identification:  This species has a thin, strongly inflated, cream shell marked with wide spiral brown bands. The body is cream grading to maroon marginally with a white marginal band.

Natural history:  Although Hydatina zonata is typically considered to be a rare species found in sand at depths of 30-60 m (100-197 ft), the live Maui animal was found at a depth of less than 3 m (10 ft).

Distribution:  Maui and Oahu.

Taxonomic notes:  This species is listed in Kay, 1979, Edmondson, 1946, Quirk & Wolfe, 1974, Morris, 1974 and Tinker, 1958 as Hydatina albocincta (Quoy & Gaimard, 1825) which is probably a synonym (see discussion on the Sea Slug Forum).

Photo:  Patty Daly: about 30 mm: Maalaea Bay, Maui; June 18, 2022.

Observations and comments:

Note 1:  ( )
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